southern green roofs - clemson university › cafls › vincent › powerpoints › ... · types of...
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Southern Green Roofs
HORT 4000 Katherine Hollifield
July 23, 2016
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What images do you think of when you hear the term
“Green Roof”?
https://blog.shubhpuja.com/2015/12/17/thoughts-on-thoughts/
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• Green shingles on a roof
• A green metal roof
• A sod roof
http://www.materials-world.com/shingles/ certainteed/independence/sub_HunterGreen.htm
http://ridgelinemetal.com/metal-roofing/
http://landarchs.com/grass-roof/
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• A roof with solar panels
• Grass growing on a roof
http://www.directindustry.com/prod/solarworld-ag/product-54786-441838.html
https://www.pinterest.com/mabely1227/grass-roof/
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• An old roof with moss growing on it
• Carrabba’s Italian Grill restaurant
http://www.sigroofing.co.uk/why-copper-wire-is-the-solution-for-a-moss-free-roof/
http://retailrestaurantfb.com/the-latest-news/carrabba-s-italian-grill-names-new-president
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A green roof is a specially prepared roof with plants growing in media.
Chicago Botanic Garden
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Other Names
Vegetative roof
Living roof
Garden roof
Planted rooftop
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Maintenance
• When green roofs were first installed in the United States, many thought that no maintenance was needed.
• Over the years, those in the industry have noted that these roofs are low maintenance, not “no” maintenance (K. Laminack, with Moore Farms and Botanical Garden, personal communication, 6/25/16).
Kirk Laminack
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Challenges to Roofs in the South
Because of high heat, irrigation is necessary. The high humidity in the south adds to the susceptibility of plants to diseases. Pythium can be a problem of southern green roofs, according to Green Roof Outfitters (M. Whitfield and C. Simmons, personal communication 6/14/2016).
http://greenroofoutfitters.com/about/meet-the-team/
Michael Whitfield
Chris Simmons
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Layers Each green roof is constructed in layers. A traditional green roof is constructed by laying down each layer over the entire roof at the same time. If using modules, the waterproofing and insulation layers will be installed, and then modules containing the remaining layers will be placed on top.
https://www.youtube.com/watch?v=sQ3veFk1C24
https://www.youtube.com/watch?v=jbSqygIpBUE
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Layers
The basic layers of a green roof are:
• The roof deck
• A waterproofing membrane
• Root barrier
• Drainage layer
• Insulation (per building code)
• Filter fabric
• Media
• Plants
(K. Laminack, with Moore Farms and Botanical Garden, personal communication, 6/25/16)
Kirk Laminack
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Layers of a sustainable green roof.
Image via Penn State University, Olivia Miller’s Blog. http://sites.psu.edu/millerdesignblog/2013/03/12/green-roofs/
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Waterproof Membrane
It is essential to regularly check for leaks in the waterproofing membrane.
http://www.doubledogremodel.com/building-a-seattle-green-roof/
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If there is a failure in the membrane, it may be easier to correct the problem if using a modular system such as GROWVista 2, the modular system available through Green Roof Outfitters (M. Whitfield and C. Simmons, personal communication 6/14/2016). Their modules are made of 100% recycled plastics.
http://greenroofoutfitters.com/green-roof-system/modular-options/intensive-green-roof-system/
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Types of Green Roofs
• Extensive
– Media up to 6” deep
• Intensive
– Media over 6” deep
• Semi-Intensive
- Media depth between that of extensive and intensive
Cantor, Steven L. (2008) Green Roofs In Sustainable Landscape Design. W.W. Norton & Company, Inc., New York, N.Y. GSA. 3.0 Cost Benefit Analysis, GSA Green Roof Benefits and Challenges. www.gsa.gov/portal/mediaId/167839/filename/cost_benefit_analysis.action GSA. System Overview. https://sftool.gov/explore/green-building/section/76/green- roof/system-overview Philadelphia Water Stormwater Plan Review, 4.3 Green Roofs, http://www.pwdplanrefiew.org/manual/chapter-4/4.3-green-roofs Upstate Forever. (7/9/16) Green Roofs. www.upstateforever.org/pdfs/other/caw_LIDFact_GreenRoofs.pdf
https://theanarchist.wordpress.com/2008/10/06/how-to-build-a-green-wall-or-green-roof/
https://theanarchist.wordpress.com/2008/10/06/how-to-build-a-green-wall-or-green-roof/
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Green Roof Benefits
• Reduce impermeable surfaces
• Increase biodiversity
• Reduce water runoff
• Improve storm water management
• Improve air quality
• Increase life of roof
• Block out noise
• Insulate from summer heat and winter cold (Cantor 2008)
Cantor, Steven L. (2008) Green Roofs In Sustainable Landscape Design. W.W. Norton & Company, Inc., New York, N.Y.
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Green Roof Disadvantages
• Increased weight on roof
– Platform, media, plants
– Consultations with engineer/architect
(M. Whitfield and C. Simmons, with Green Roof Outfitters, personal communication 6/14/2016)
• Consult local building codes
• Initial cost
http://www.greenroofs.com/projects/pview.php?id=1337
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Incentives
Many states and cities across the country offer tax incentives for adding green roofs to structures to help manage storm water; South Carolina does not.
Michael Whitfield and Chris Simmons, with Green Roof Outfitters, see this as one reason why there are so few green roofs in South Carolina (M. Whitfield and C. Simmons, personal communication 6/14/2016).
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Incentives
Below are a few of the incentives available in other states.
Location Incentive
Austin, TX credits
Baltimore, MD credits are earned to use against storm water management fee
Chicago, IL green roof fee credit
Cincinnati, OH green roof loans; storm water management fee credit
Indianapolis, IN monthly storm water user fee credit
Nashville, TN green roof rebate
New York, NY storm water retrofit program construction grant
Portland, OR $5/ft2 incentive
Seattle, WA storm water management bill credit
Washington, DC green roof rebate program; storm water fee discount
http://www.vegetalid.us/green-roof-technical-resources/green-roof-and-stormwater-management-incentives.html
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Toronto
Toronto, Canada has a bylaw that requires green roofs on new construction.
The percentage coverage requirements are:
Gross Floor Area *
(Size of Building)
Coverage of Available Roof Space
(Size of Green Roof)
2,000-4,999 m2 20%
5,000-9,999 m2 30%
10,000-14.999 m2 40%
15,000-19.999 m2 50%
20,000 m2 or greater 60%
* Note: Residential buildings less than 6 storeys or 20m in height are exempt from being required to have a green roof. http://www1.toronto.ca/wps/portal/contentonly?vgnextoid=3a7a036318061410VgnVCM10000071d60f89RCRD#thresholds
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United States Air Force
• The United States Air Force published guidelines to instruct users toward the decision to, or not to, install a green roof to save energy (HQ 2011).
• These criteria apply to installations in the Continental United States (CONUS) and their guidelines include a list of bases and each is given a score based on the energy benefits and irrigation demand of a green roof (HQ 2011).
• The highest score (best) possible is 13 and both Charleston AFB and Shaw AFB in South Carolina scored 10, which is considered “fair” in this publication (HQ 201.
https://www.wbdg.org/ccb/AF/AFETL/etl_11_8.pdf
HQ AFCESA/CEO. (1/13/2011). Engineering Technical Letter (ETL) 11-8: Decision Criteria for Installing Vegetative Green Roofs at Conus Installations. Department of the Air Force. Headquarters Air Force Civil Engineer Support Agency. https://wbdg.org/ccb/AF/AFETL/etl_11_8.pdf
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Online Green Roof Energy Calculator
One drawback to this site for someone wanting to add a green roof in South Carolina is the fact that Charleston is the only city included in the list (Green).
Green Roof Energy Calculator (v. 2.0). Green Building Research Laboratory. Portland State University. http://greenbuilding.pdx.edu/GR_CALC_v2/grcalc_v2.php#retain
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Recommended plants
• Plants with Crassulacean Acid Metabolism, CAM, such as Sedum, Allium, Euphorbia and Delosperma (Live)
• The Whole Building Design Guide (WBDG) recommends using Potentilla, Carex, Phlox, Delosperma, Crassula, Portulaca and Aloe (Miller 2016).
• Plants from these families: Portulacaceae, Crassulaceae and Euphorbiaceae (Li).
Li, W.C. (2014). A comprehensive study of green roof performance from environmental perspective. International Journal of Sustainable Built Environment 3, 127-134. Live Roof. Resources for Architects and Engineers. http://liveroof.com/architecture- and-engineering/ Miller, Charlie. (3/14/2016). Extensive Vegetative Roofs, Whole Building Design Guide. National Institute of Building Sciences.
https://www.nyu.edu/about/news-publications/news/2012/05/04/nyu-garden-shop-plant-of-the-week-may-3-2012.html
http://www.greenroofplants.com/catalog/plant-catalog/viewplant/?plantid=204
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Guidelines • International
– Forschungsgesellschaft Landschaftsentwicklung Landschaftsbau e.V., (FLL) Guideline for the Planning, Execution and Upkeep of Green Roof Sites (Philippi; Cantor 2008)
– Free
• United States
– American guidelines (ASTM)
– $50 (ASTM)
ASTM International. Standard Guide for Vegetative (Green) Roof Systems. https://www.astm.org/Standards/E2777.htm Cantor, Steven L. (2008) Green Roofs In Sustainable Landscape Design. W.W. Norton & Company, Inc., New York, N.Y. Philippi, Peter M. Introduction to the German FLL-Guideline for the Planning, Execution and Upkeep of Green-Roof Site. https://www.epa.gov/sites/production/files/documents/IntroductiontotheGermanFLL2.pdf
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Recommended Plants for the Southeast?
• Many companies sell plant mixes and have a recommended plant list. However, many do not offer either of those for the southeast (Greengrid).
GreenGrid Roofs. Downloads. http://www.greengridroofs.com/about/downloads.htm
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Factors of a Successful Green Roof
The factors that make a green roof successful are variable, depending on the point of view.
Jeff Baker and Zack Roach, with Clemson Landscape Services, both agree that one of the factors that make a site successful is plant survival (J. Baker and Z. Roach, personal communication, 7/1/16).
An architect or designer may agree that a successful site is one that adds visual interest and is aesthetically pleasing.
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Successful Green Roofs
http://greenroofoutfitters.com/about/featured-projects/#!
VA hospital Charleston, SC
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Bon Secours St. Francis Health System Millennium Cancer Treatment Center
Greenville, SC
http://www.livingroofsinc.com/portfolio/commercial/bon-secours-st-francis-health-system-millennium-cancer-center/
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S.E.W. Eurodrive Lyman, SC
http://www.livingroofsinc.com/portfolio/commercial/s-e-w-eurodrive/
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J.L. McMillan Federal Building Florence, SC
http://www.greenroofs.com/projects/pview.php?id=1603
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Furman Office Building Greenville, SC
http://www.greenroofs.com/projects/pview.php?id=56
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USC Darla Moore School of Business Columbia, SC
http://www.livingroofsinc.com/portfolio/university/usc-darla-moore-school-of-business/
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Taco Boy Restaurant Charleston, SC
http://www.livingroofsinc.com/portfolio/commercial/taco-boy-restaurant/
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21st space wing headquarters building Peterson Air Force Base, CO
http://www.greenroofs.com/projects/pview.php?id=1243
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Duke University Ocean Conservation Center
Beaufort, NC
http://www.livingroofsinc.com/portfolio/university/duke-university-ocean-conservation-center/
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Chicago City Hall Chicago, IL
http://www.powerhousegrowers.com/6-successful-sustainable-green-roof-projects/
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Rockefeller Center New York, NY
http://www.powerhousegrowers.com/6-successful-sustainable-green-roof-projects/
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GENO Haus Stuttgart, Germany
http://www.powerhousegrowers.com/6-successful-sustainable-green-roof-projects/CII-
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Sohrabji Godrej Green Business Centre Hyderabad, India
http://www.powerhousegrowers.com/6-successful-sustainable-green-roof-projects/
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Ford Rouge Center Dearborn, MI
http://www.powerhousegrowers.com/6-successful-sustainable-green-roof-projects/
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Moore Farms Botanical Garden Lake City, SC
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Moore Farms Botanical Garden Lake City, SC
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Moore Farms Botanical Garden Lake City, SC
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Lee Hall III at Clemson University Clemson, SC
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Lee Hall III at Clemson University Clemson, SC
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Award Winning Green Roofs
2006 Green Roofs for Healthy Cities Award of Excellence
• Intensive Industrial/Commercial Category
• Manulife Insurance Building
• 601 Congress
• South Boston, MA
http://www.hydrotechusa.com/projects/601-congress
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2003 Green Roofs for Healthy Cities Award of Excellence
• Extensive New Construction Category
• Gap Inc.
• 901 Cherry Avenue
• San Bruno, CA
http://www.hydrotechusa.com/projects/901-cherry-avenue-gap
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2010 Green Roofs for Healthy Cities Award of Excellence
• Intensive Institutional Category
• American Society of Landscape Architects Headquarters
• Washington, DC
http://www.hydrotechusa.com/projects/american-society-landscape-architects-headquarters-0
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2008 Green Roofs for Healthy Cities award of Excellence
• Intensive Institutional Category
• Austin City Hall
• Austin, TX
http://www.hydrotechusa.com/projects/austin-city-hall
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2014 Green Roofs for Healthy Cities Award of Excellence
• Extensive Institutional
• NOAA Southwest Fisheries Science Center
• San Diego, CA
http://greenroofs.org/index.php/resources/awards-of-excellence/2014-award-winners/2-uncategorised/316-noaa-southwest-fisheries-science-center
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2003 Green Roofs for Healthy Cities Award of Excellence
• Extensive Institutional Category
• LDS Conference Center
• Salt Lake City, UT
http://www.hydrotechusa.com/projects/lds-conference-center
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2015 Extensive Industrial/Commercial Green Roof Award
• Berry Architecture Office
• Red Deer, Alberta, Canada
http://greenroofs.org/index.php/resources/awards-of-excellence/2015-award-winners/2-uncategorised/345-2015-extensive-industrial-commercial
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2015 Green Roofs for Healthy Cities Award of Excellence
• Extensive Institutional Green Roof Award
• The Krishna P. Singh Center for Nanotechnology
• University of Pennsylvania
• Philadelphia, PA
http://greenroofs.org/index.php/resources/awards-of-excellence/2015-award-winners/2-uncategorised/346-2015-extensive-institutional
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2015 Green Roofs for Healthy Cities Award of Excellence
• Intensive Institutional Green Roof Award
• Helen Schuler Nature Center
• Lethbridge, AB, Canada
http://greenroofs.org/index.php/resources/awards-of-excellence/2015-award-winners/2-uncategorised/352-2015-intensive-institutional
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Green Roof of the Year 2014
• Allianz Insurance Company
• Stuttgart, Germany
http://www.greenrooftechnology.com/green-roof-blog/green-roof-of-the-year-2014
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2006 Green Roofs for Healthy Cities Award of Excellence
• Intensive Institutional Category
• Mashantucket Pequot Museum & Research Center
• Mashantucket, CT
http://www.hydrotechusa.com/projects/mashantucket-pequot-museum-research-center
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2014 Green Roofs for Healthy Cities
• Intensive Industrial/Commercial Green Roof Award
• Whole Foods Market
• Lynnfield, MA
http://www.greenroofs.com/projects/pview.php?id=1612
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2006 Green Roofs for Healthy Cities Award of Excellence
• Extensive Institutional Category
• 2006 AIA/COTE Top Ten Green Project
• Ballard Library
• Seattle, WA
http://www.hydrotechusa.com/projects/ballard-library
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2006 Excellence in Irrigation Honor Award from the American Society of Irrigation Consultants and the 2005 Green Roofs for Healthy Cities Awards of Excellence in the Intensive Industrial/Commercial category
• Millennium Park
• Chicago, IL
http://www.greenroofs.com/projects/pview.php?id=459
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South Carolina Green Roof Inventory
• Below is a list of green roofs in South Carolina, as shown on the Greenroofs.com projects database (Greenroofs).
• Users of this site, www.greenroofs.com can sort the database by project name, roof size, project year, location, roof size, designer and more (Greenroofs).
Greenroofs.com. 7/6/2016. http://www.greenroofs.com/projects/plist.php
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Project Year Location Roof Size
Lee Hall III 2012 Clemson University 30,000 ft2
S.E.W Eurodrive 2013 Lyman, SC 3,000 ft2
Bon Secours St. Francis Health System
Millennium Cancer Treatment Center
2014 Greenville, SC 1,700 ft2
This database is not a complete list of green roofs in South
Carolina. For example, the following projects are not listed.
(J. Baker and Z. Roach, personal communication, 7/1/16;
Livingroofs)
Livingroofs, Inc. http://www.livingroofsinc.com/portfolio/commercial/s-e-w-eurodrive/
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Award winning green roofs are not located in the southeast, so they are not exposed to the hot, humid conditions experienced in South Carolina.
Green roof research is lacking in South Carolina.
This is shown in the lack of plant survival in the sedum mats that were installed on the green roof on Lee Hall III at Clemson University (J. Baker and Z. Roach, personal communication, 7/1/16).
Kirk Laminack, with Moore Farms and Botanical Garden in Lake City, SC, noticed that sedums do not do well on green roofs in South Carolina (K. Laminack, Personal Communication, 6/25/16).
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Recommendations
• Green roofs should be tailored to local climates.
• Someone should think outside the sedum box to discover the varieties of plants that are best suited for southern green roofs.
http://www.greenroofsolutions.com/plants.html